Redirects within prefetching using TanStack Query don't work

[CarelessInternet]

Which project does this relate to?

Start

Describe the bug

Redirects called by a server function that is called by TanStack Query in a loader prefetch should redirect, but instead causes a serialization (Seroval) error. The documentation implies it should(?) work.

Your Example Website or App

https://github.com/CarelessInternet/tanstack-start-serializaton-repro

Steps to Reproduce the Bug or Issue

1. Go to the index route.

index.tsx:

const getData = createServerFn({ method: 'GET' })
	.handler(() => {
		throw redirect({ to: '/about' })
	});

const options = queryOptions({
	queryKey: ['data'],
	queryFn: () => getData(),
});

export const Route = createFileRoute('/')({
	component: App,
	loader: async () => await queryClient.prefetchQuery(options),
});

2. Check the terminal.

Output:

Serialization error: 1 | var L=(i=>(i[i.AggregateError=1]="AggregateError",i[i.ArrowFunction=2]="ArrowFunction",i[i.ErrorPrototypeStack=4]="ErrorPrototypeStack",i[i.ObjectAssign=8]="ObjectAssign",i[i.BigIntTypedArray=16]="BigIntTypedArray",i[i.RegExp=32]="RegExp",i))(L||{});var v=Symbol.asyncIterator,mr=Symbol.hasInstance,R=Symbol.isConcatSpreadable,C=Symbol.iterator,pr=Symbol.match,dr=Symbol.matchAll,gr=Symbol.replace,yr=Symbol.search,Nr=Symbol.species,br=Symbol.split,vr=Symbol.toPrimitive,P=Symbol.toStringTag,Cr=Symbol.unscopables;var rt={0:"Symbol.asyncIterator",1:"Symbol.hasInstance",2:"Symbol.isConcatSpreadable",3:"Symbol.iterator",4:"Symbol.match",5:"Symbol.matchAll",6:"Symbol.replace",7:"Symbol.search",8:"Symbol.species",9:"Symbol.split",10:"Symbol.toPrimitive",11:"Symbol.toStringTag",12:"Symbol.unscopables"},ve={[v]:0,[mr]:1,[R]:2,[C]:3,[pr]:4,[dr]:5,[gr]:6,[yr]:7,[Nr]:8,[br]:9,[vr]:10,[P]:11,[Cr]:12},tt={0:v,1:mr,2:R,3:C,4:pr,5:dr,6:gr,7:yr,8:Nr,9:br,10:vr,11:P,12:Cr},nt={2:"!0",3:"!1",1:"void 0",0:"null",4:"-0",5:"1/0",6:"- | ... truncated 
2 | `:return"\\n";case"\r":return"\\r";case"\b":return"\\b";case"       ":return"\\t";case"\f":return"\\f";case"<":return"\\x3C";case"\u2028":return"\\u2028";case"\u2029":return"\\u2029";default:return o}}function y(e){let r="",t=0,n;for(let a=0,s=e.length;a<s;a++)n=fn(e[a]),n&&(r+=e.slice(t,a)+n,t=a+1);return t===0?r=e:r+=e.slice(t),r}function Sn(e){switch(e){case"\\\\":return"\\";case'\\"':return'"';case"\\n":return`
3 | `;case"\\r":return"\r";case"\\b":return"\b";case"\\t":return"       ";case"\\f":return"\f";case"\\x3C":return"<";case"\\u2028":return"\u2028";case"\\u2029":return"\u2029";default:return e}}function D(e){return e.replace(/(\\\\|\\"|\\n|\\r|\\b|\\t|\\f|\\u2028|\\u2029|\\x3C)/g,Sn)}var U="__SEROVAL_REFS__",ce="$R",Ie=`self.${ce}`;function mn(e){return e==null?`${Ie}=${Ie}||[]`:`(${Ie}=${Ie}||{})["${y(e)}"]=[]`}var Ar=new Map,j=new Map;function pn(e,r){return Ar.set(r,e),j.set(e,r),r}function Er(e){return Ar.has(e)}function dn(e){return j.has(e)}function ct(e){if(Er(e))return Ar.get(e);throw new Re(e)}function ft(e){if(dn(e))return j.get(e);throw new Pe(e)}typeof globalThis!="undefined"?Object.defineProperty(globalThis,U,{value:j,configurable:!0,writable:!1,enumerable:!1}):typeof window!="undefined"?Object.defineProperty(window,U,{value:j,configurable:!0,writable:!1,enumerable:!1}):typeof self!="undefined"?Object.defineProperty(self,U,{value:j,configurable:!0,writable:!1,enumerable:!1}):typeof global!="undefined"&&Obje | ... truncated 

error: Seroval Error (specific: 1)
 value: Response (0 KB) {
  ok: false,
  url: "",
  status: 307,
  statusText: "",
  headers: Headers {},
  redirected: false,
  bodyUsed: false
},

      at Da (/workspaces/node_modules/seroval/dist/esm/production/index.mjs:3:31653)
      at Jr (/workspaces/node_modules/seroval/dist/esm/production/index.mjs:3:28561)
      at Wr (/workspaces/node_modules/seroval/dist/esm/production/index.mjs:3:28874)
      at Jr (/workspaces/node_modules/seroval/dist/esm/production/index.mjs:3:28561)
      at Wr (/workspaces/node_modules/seroval/dist/esm/production/index.mjs:3:28874)
      at ba (/workspaces/node_modules/seroval/dist/esm/production/index.mjs:3:28377)
      at va (/workspaces/node_modules/seroval/dist/esm/production/index.mjs:3:28440)
      at Jr (/workspaces/node_modules/seroval/dist/esm/production/index.mjs:3:28561)
      at Wr (/workspaces/node_modules/seroval/dist/esm/production/index.mjs:3:28874)
      at Jr (/workspaces/node_modules/seroval/dist/esm/production/index.mjs:3:28561)
      at Wr (/workspaces/node_modules/seroval/dist/esm/production/index.mjs:3:28874)
      at Jr (/workspaces/node_modules/seroval/dist/esm/production/index.mjs:3:28561)
      at Wr (/workspaces/node_modules/seroval/dist/esm/production/index.mjs:3:28874)
      at G (/workspaces/node_modules/seroval/dist/esm/production/index.mjs:3:32851)
      at Qr (/workspaces/node_modules/seroval/dist/esm/production/index.mjs:3:32910)
      at cn (/workspaces/node_modules/seroval/dist/esm/production/index.mjs:3:34151)
      at <anonymous> (/workspaces/node_modules/@tanstack/router-core/dist/esm/ssr/ssr-server.js:174:4)

Expected behavior

The user should be redirected to the route /about.

Screenshots or Videos

No response

Platform

• Router / Start Version: 1.168.10/1.167.16
• OS: Linux
• Browser: Zen (Firefox)
• Browser Version: 1.19.5b
• Bundler: Vite
• Bundler Version: 8.0.8

Additional context

No response